Det-Tronics UD20 FlexVu Explosion-Proof Universal Display Unit - Manual (Page 3)

INSTRUCTIONS
FlexVu ® Explosion-Proof
Universal Display Unit
Model UD20
Important
Be sure to read and understand the entire
instruction manual before installing or operating
the gas detection system. The Model UD20 is to
be used with the GT3000 to provide early warning
of the presence of a toxic gas mixture. Proper
device installation, operation, and maintenance is
required to ensure safe and effective operation. If
this equipment is used in a manner not specified in
this manual, safety protection may be impaired.
ApplicAtion
The FlexVu ® Model UD20 Universal Display Unit is
designed to be used with the GT3000 Toxic Gas
Detector.
It is recommended for applications where a 2-wire loop
powered gas detector is required. The output is a 4-20
mA signal with HART, corresponding to the output of
the GT3000 detector.
Gas concentrations are displayed on an alpha-numeric
display in ppm (% for O
2
). The display unit reads the
linear 4-20 mA DC output signal from the GT3000 that
corresponds to the detected gas concentration. The
UD20 automatically detects the gas type and operating
range of the sensor to which it is connected via the
HART signal.
All electronics are enclosed in an explosion-proof
aluminum or stainless steel housing. The display unit
is used with a single GT3000, which may be either
directly coupled to the display unit, or remotely located
using a sensor termination box. The UD20 features
non-intrusive calibration, which can be performed by
using a handheld magnet to activate internal magnetic
switches on the faceplate. Calibration can also be
performed by activating the GT3000’s internal magnetic
reed switch with a magnet.
Description
The UD20 provides display and control capabilities for the
GT3000, and utilizes the following I/O:
Signal Inputs: 4-20 mA loop with HART,
from the GT3000
User Inputs: Magnetic switches (4),
on the display panel
Visible Outputs: LCD display
Signal Outputs: 4-20 mA loop with HART,
from the GT3000
3.1 © Detector Electronics Corporation 2012 Rev. 10/12 95-8620